To put it simply, I want to play a non-strategy RPG where I can summon minions to do my bidding. Only game I remember being able to do that was in Neverwinter Nights. I didn't have the patience for it back then, not sure if I'd have the patience for it now, so I'd like some other options if possible. I'd prefer a turn-based RPG, but action or mixed is fine. Also, Western or Japanese are fine, too, so long as the "Summoner" summons something that fights alongside or for you.

Many Megami Tensei games fall under this umbrella, especially Devil Summoner games (the last two on PS2 have been localized, another remake coming soon for 3DS in English). For the last two games, summoning and making good use of the summoned allies both inside and outside the battle form an important part of the game.

And pretty much every game ever to feature monster teammates. FFXIII-2, DQV, any random SMT game, any random Pokemon game (though debatable since your entire party is catch-able monsters while your trainer only shows up to fling their balls at everything that looks at them funny), any card game video game (i.e. Magic the Gathering and pretty much everything coming from Japan these days), ect...

Morrowind has a brilliant mod that lets you be a true Necromancer, in a sense that you need to prepare dead bodies, by forcing their decay by leaving them out in the wilderness, carrying them over your shoulder if they're still formed, and using special salts to keep them as fresh as you need. It also adds Back Soul Gems.